4850 or 5770

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The HD4770 is only slightly less powerful than an HD4850. Compared to an HD5750 it probably lags behind in performance %20-30. Considering the card is currently about $50 more expensive than the HD4770 and will require a new PSU while an HD4770 wouldn't we are talking about over twice the price for a %20-30 increase in performance. Maybe you consider that "totally worth it" but I sure don't and I doubt many other people would either.
As for the crysis benchmarks whatever. If you want to spend over twice the money to max out the settings in one game then be my guest but at that resolution an HD4770 would be great for every other game. AsAnAtheist is entirely wrong about an HD4770 not being able to handle AA or "depth distance" at 1280x1024. The only scenario that will give that card any problems at that resolution is a maxed out Crysis. Crysis was released two years ago now and there's still no game that's more demanding and there aren't reports of any game that will top in the foreseeable future. The game is also quite cpu intensive so I'm not certain if the HD4770 would be the limiting factor in that situation in any case.
 
Thank all.
but guru3d is saying 5750 like 5770 in load + PC requires 40 amp on rail12v
do you think that is true? how can it be?
if yes, I don't have it! I have just 30
 


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When I bought my GTX260, I ran all the system with a 500W PSU, and the GPU manufacturer said that I needed a 550W PSU at least.
 
Power Consumption 3DMark06 load:

5700_power3dm.png



Power Consumption FurMark stress test:

5700_powerfur.png




Source:
http://www.xbitlabs.com/articles/video/display/radeon-hd5770-hd5750_5.html#sect0
 
Thanx for this bench
But What I got is the amperage problem because of this:
The power usage of a VGA card or a CPU is shared between the on the this rails:12v, 5v, 3.3v and VGA card's core uses 12v and it's memory uses 3.3v . there is somethings that I don't know and because of all this factors 5770 or 5750 Suddenly needs more current on rail 12v ( I don't know how much exactly) and possibly My PC with a 5770 or even 5750 needs more than 30amps.(of course I am not sure about it)
Who can exactly explain the detali about this issue?